Rick Adair, who took a leave of absence as the Orioles pitching coach on Aug. 15, will not return to the club next season, according to an industry source.

The club will conduct interviews next week and would like to have a decision made by the end of the month. Bill Castro, the Orioles' bullpen coach who took over for Adair in August, will be in the mix, the source said.

However, given that the Orioles are conducting interviews, it’s more likely the club will hire from outside the organization. A new hire would be the fifth Orioles’ pitching coach during manager Buck Showalter’s regime.

He inherited Rick Kranitz in 2010; hired Mark Connor before the 2011 season and when Connor stepped down that June, Adair was moved from bullpen coach to pitching coach.

Signed through 2014, Adair, 55, took the leave of absence for personal reasons, which included the health of his father, who passed away in September. Castro then moved into the pitching coach role and was not given an interim tag – an indication Adair would not be back.

Former Oriole Scott McGregor, who had spent years in the organization instructing pitching, took over as bullpen coach in August. That position, presumably, is also open.

The Orioles’ pitching staff compiled a 4.20 ERA that ranked 10th in the American League last year. Their rotation’s 4.57 ERA was 12th in the league while the bullpen ERA was 3.52, good enough for sixth in the league.

MASNsports.com first reported that Adair officially would not be coming back.